Horizontal blanking interval

<h2 id="hblank-effects">HBlank effects</h2>
<p class="note">See also: <a href="/facts/Raster_interrupt/8Ku1ayjb">Raster interrupt</a></p>
<p>Some graphics systems can count horizontal blanks and change how the display is generated during this blank time in the signal; this is called a <a href="/facts/Raster_effect/pXPNCUo3">raster effect</a>, of which an example is <a href="/facts/Raster_bar/qWy614qe">raster bars</a>.
</p><p>In video games, the horizontal blanking interval was used to create some notable effects. Some methods of <a href="/facts/Parallax_scrolling/pXPNCUo3">parallax scrolling</a> use a raster effect to simulate depth in consoles that do not natively support multiple background layers or do not support enough background layers to achieve the desired effect. One example of this is in the game <i><a href="/facts/Castlevania%3a_Rondo_of_Blood/jkKopU12">Castlevania: Rondo of Blood</a></i>, which was written for the <a href="/facts/PC_Engine_CD-ROM/MBWz7xPU">PC Engine CD-ROM</a> which does not support multiple background layers. The <a href="/facts/Super_Nintendo_Entertainment_System/uRT5Sa6s">Super Nintendo Entertainment System</a>'s <a href="/facts/Mode_7/AXRme9yb">Mode 7</a> uses the horizontal blanking interval to vary the scaling and rotation, per scan line, of one background layer to make the background appear to be a 3D plane.
</p>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Nominal_analogue_blanking/GkkP0nQX">Nominal analogue blanking</a></li>
<li><a href="/facts/Vertical_blanking_interval/2lhsCf2S">Vertical blanking interval</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Gupta, R. G. (2006). Television Engineering and Video Systems. Tata McGraw-Hill. p. 62. ISBN 0-07-058596-2. Retrieved 25 September 2010. <a href="0-07-058596-2" target="_blank">0-07-058596-2</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Pemberton, Alan (30 November 2008). "World Analogue Television Standards and Waveforms". Pembers' Ponderings. Sheffield, England. Archived from the original on Feb 20, 2008. Retrieved 25 September 2010. <a href="https://web.archive.org/web/20080220113153/http://www.pembers.freeserve.co.uk/World-TV-Standards/index.html" target="_blank">https://web.archive.org/web/20080220113153/http://www.pembers.freeserve.co.uk/World-TV-Standards/index.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"What does 'Rb' mean?". <a href="http://tvone.crmdesk.com/answer.aspx?aid=448&back=" target="_blank">http://tvone.crmdesk.com/answer.aspx?aid=448&back=</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Horizontal blanking interval open-in-new

Horizontal blanking interval